International Journal of Civil EngineeringIJCEEngineering & Technologyhttp://ijce.iust.ac.ir18agent21735-05222383-387410.22068/IJCEenjalali1387121gregorian20093171online1fulltextenEffect of Particle Crushing on Shear Strength and Dilation Characteristics of Sand-Gravel MixturesResearch PaperResearch Paper<font size="1" face="Times-Italic"><font size="1" face="Times-Italic"><p align="left">There are limitations in experimental studies on sand-gravel mixtures due to the small size of testing</p><p align="left">specimens. Due to this problem, many researchers have worked on prediction of the shear strength of mixture by testing</p><p align="left">the sandy fraction of soil alone and developed empirical relationships. Most of the previous relationships have been</p><p align="left">determined for low surcharge pressures in which particle breakage does not affect the shear strength parameters.</p><p align="left">However, the particle breakage affects the relationships in higher confinements. At the present study, the results of</p><p align="left">large scale direct shear tests on sand and sand-gravel mixtures was used to investigate the shear behavior and</p><p align="left">dilatancy characteristics in a wider range of surcharge pressures. The gravel content, relative density, surcharge</p><p align="left">pressure and gravel grain size were considered as variables in testing program. The relationships between shear</p><p align="left">strength characteristics of sand and sand-gravel mixtures were determined considering dilation characteristics of the</p><p align="left">soil. In this regard, the minimum void ratio was found as a useful indirect index that relates uniquely to the critical</p><p align="left">state friction angle independent of soil gradation. The relations between critical state or peak friction angles of the</p><p align="left">mixture with minimum void ratio were determined as a function of surcharge pressure. The correlations could be useful</p><p align="left">for determination of the strength parameters of sand-gravel composites by testing sandy fraction of mixture.</p></font></font>sand-gravel mixture, direct shear tests, dilation, friction angle, surcharge pressure, particle crushing, effects, minimum void ratio6171http://ijce.iust.ac.ir/browse.php?a_code=A-10-499-3&slc_lang=en&sid=1A.Hamidihamidi@tmu.ac.ir180031947532846006056180031947532846006056Yes
M.Alizadeh180031947532846006057180031947532846006057NoS.M. Soleimani180031947532846006058180031947532846006058No